https://nitter.cf/t.co/83WvBsz8Jg https://nitter.cf/t.co/tXChfLAuZ9
Joined February 2015
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诺贝尔物理学奖百年 · 1905：勒纳德与阴极射线
A Century of Nobel Physics · 1905: Lenard and cathode rays
A foil window that let cathode rays out of the tube, and how fast and how light they are, worked out on screen. English, with a Chinese audio track.
youtu.be/fxH6Vb24AnM
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诺贝尔物理学奖百年 · 1904：瑞利勋爵与氩
A Century of Nobel Physics · 1904: Lord Rayleigh and argon
Nitrogen that weighed one part in a thousand too much, a new gas in the air, and how much of the air is argon, worked out on screen. English, with a Chinese audio track.
youtu.be/qdrQHIBuW6c
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诺贝尔物理学奖百年 · 1903：贝克勒尔、居里夫妇与放射性
A Century of Nobel Physics · 1903: Becquerel, the Curies and radioactivity
A plate left in a drawer, polonium and radium, and the law of decay worked out on screen. English, with a Chinese audio track.
youtu.be/yrrzFUN5Pk8
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诺贝尔物理学奖百年 · 1902：洛伦兹、塞曼与塞曼效应
A Century of Nobel Physics · 1902: Lorentz, Zeeman and the Zeeman effect
How a magnet changed the light of a salt flame, and how Lorentz explained it. English, with a Chinese audio track.
youtu.be/aUhXuLOE-J0
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诺贝尔物理学奖百年 · 1901：伦琴与 X 射线
A Century of Nobel Physics · 1901: Röntgen and X-rays
The first Nobel Prize in Physics: how X-rays were found, what they are, and why bones show. English, with a Chinese audio track.
youtu.be/kxwWR0UKF64
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A month of 3D printing with AI: 30+ little soldiers, seven eras. AI drew, researched, modelled and printed them; I picked the eras and said yes or no. Then I wanted to know what they're holding. Part 1, knights to pikes, every story on its source page: youtu.be/csrAELMzkqU
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A Rubik's Cube has 43,252,003,274,489,856,000 reachable states, exactly 1/12 of what you get by taking it apart and putting it back at random.
Why 1/12? A 22-minute tour of group theory, in Chinese with English subtitles:
youtu.be/vKuEZ0ek054
#math #RubiksCube
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A deceptively simple map puzzle — any map can be colored with just four colors so that no two neighboring regions match — stumped mathematicians for 170 years. From an 1852 letter, to an 1879 "proof" believed for eleven years before it broke, to the 1976 computer proof no human could fully read, all the way to today, when AI has begun to create new mathematics. This episode isn't only about the Four Color Theorem — it's about a deeper question: when we say something is "proved," why do we believe it?
youtube.com/watch?v=-mzrShuU…
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1796 年 3 月 30 日清晨，一个还差一个月才满 19 岁的年轻人，想通了欧几里得之后两千年里没有人做到的事——只用直尺和圆规，画出正十七边形。但比"画出来"更深的问题是：为什么可以画？
本片从零讲起：费马素数、模 17 的时钟、高斯周期、Galois 群、四层二次扩张，直到 cos(2π/17) 的显式闭式与 Richmond 的二十步作图，再到 Wantzel 与 Lindemann 关上古希腊三大难题的门。youtu.be/TWnMkXEghFg
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In 1766, at age 59, Euler returned to St. Petersburg at Catherine II's invitation. He'd been blind in his right eye for sixteen years already, and the left eye was failing too. In 1771, Wenzel performed a cataract operation; a few months later the blindness became complete — both eyes gone.
Over the next seventeen years, totally blind, Euler dictated more than 400 papers — 46.9% of his lifetime 866. This episode walks through some of what he did in those seventeen years: the three-body Lagrange points L1-L5, the manual verification of Mersenne prime M_{31}, the 36-officers Latin-square conjecture. And the morning of September 18, 1783.
youtu.be/N05KoZ2n_qQ
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Detailed mathematical proofs on the companion blog → timeobserver137.cyou
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youtu.be/Yb-rS6tQb1o 这是我的新视频，有兴趣的可以关注一下。另外本期视频还带了博客的详细推导，感兴趣的看一看timeobserver137.cyou/e09-ber…
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I Built My Own RAG. Here's What Makes It Different. | Meinrag
youtu.be/_4hZrzFNERE
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Meinrag 是我自己做的 RAG (Retrieval-Augmented Generation) 工具 — 不只是搜索, 而是让你看清文档之间的脉络.
youtu.be/UKidN-HuzME
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In 1689, Jakob Bernoulli, in his Tractatus de seriebus infinitis, posed a question:
For 38 years, no one could answer it.
Eight years later, a 20-year-old Swiss man gave the answer.
This episode is about how he slowly took shape.
youtu.be/2Zv0slxYwFk?si=uafp…
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